APA (7th ed.) Citation

Hersh, R. (1997). What is mathematics, really? Oxford University Press.

Chicago Style (17th ed.) Citation

Hersh, Reuben. What Is Mathematics, Really? New York: Oxford University Press, 1997.

MLA (8th ed.) Citation

Hersh, Reuben. What Is Mathematics, Really? Oxford University Press, 1997.

Warning: These citations may not always be 100% accurate.